Sound-box for talking-machines.



PATENTED MAY 12, 1908. T. KRABMER, SOUND BOX FOR TALKING MACHINESaAPPLICATION FILED JULY15,1907.

.UNITED STATE S PATENT OFFICE.

THOMAS KRAEMER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HAWTHORNE &

SHEBLE MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA-TION OF PENNSYLVANIA.

SOUND-BOX FOR TALKING-MACHINES.

To all whom it may concern:

Be it known that I, THOMAS KRAEMER, a citizen of the United States,residing in Philadel hia, Pennsylvania, have invented certainimprovements in Sound-Boxes for Talking-Machines, of which the followingis a specification.

The object of my invention is to so construct a sound box for talkingmachines that it will comprise but few parts, each of simple andinexpensive construction. This object I attain in the manner hereinafterset forth, reference being had to the accompanying drawing, in which 7Figure 1 is a transverse vertical section of one form of sound boxconstructed in accordance with my invention; Fig. 2 is a similar View ofanother form of sound box embodying the invention; Fig. 3 is a view ofthe sound box shown in Fig. 1, looking in the direction of the arrow51;; Fig. 4 is a view of the sound box shown in Fig. 2 looking in thedirection of the arrow y; Fig. 5 is a perspective view of one of theelements of the sound box shown in Fig. 1; Fig. 6 is a perspective viewof the corresponding element of the sound box shown in Fig. 2, and Fig.7 is a view illustrating a modification of my invention.

The casing ofthe sound box shown in Figs. 1 and 3 comprises a pair ofrings 1 and 2 itting snugly one inside of the other and secured inposition by means of transverse screws or ins 3, the ring 2 havingformed integral witfi it a centrally perforated disk 4, to which isattached the tube 5 of the sound box in the ordinary manner. The ring 1has an inwardly projecting flange 6, which constitutes a seat for a ring7 of rubber or other elastic material, and between the latter and acorresponding ring 9, adapted to an annular seat 10 on the disk 4, isconfined the diaphragm 12 of the sound box. A

To a boss 13 on one side of the ring 1 is secured a plate 14 of steel orother sheet metal,

' in which is formed a slot 15 whose bottom wall presents knife-edgedlugs 16 which constitute pivotal bearings for oppositely projectingtrunnions 17'on the stylus lever 19,

the inwardly projecting arm of the latter being bent so as to bear uponthe center of the diaphragm 12, and the outwardly pro ect1ngSpecification of Letters Patent.

Application filed July 15, 1907.

Patented May 12, 1908.

Serial No. 883,720.

arm of the lever resenting a socket 20 with set screw 21 for t 1ereception and retention of the stylus.

The upper portion of the plate 14 is bent forwardly and terminates in aprojecting central spring finger 22, which bears upon the back of thestylus lever 19 and serves to maintain its inner end positivel incontact with the diaphragm 12. The only difference between the sound boxshown in Figs. 2 and 4 and that shown in Figs. 1 and 3 lies in theconformation of the stylus lever trunnions and of the plate which servesas the fulcrum and spring for the styluslever. This plate is shown at 14in Figs. 2 and 4, and it has the knife-edged lugs 16* formed on theupper wall of the slot 15, the fulcrum notches of the stylus lever 19 abeing formed in the upper faces of the,trunnions 17 instead of in theunder faces of the same. The bent u per portion of the plate isdispensed with an the tension spring 22 is projected from the lower edgeof the plate 14 and is bent so as to press upwardly upon the outwardlyprojecting arm of the stylus lever, asshown in Fig. 2, with the sameeffect as that exerted by the downwardly pressing finger 22 of the boxshown in Fig. 1.

Although I prefer to provide the stylus lever with laterally projectingtrunnions and the fulcrum plate with corresponding laterally separatedfulcrum lugs,'I may, in some cases, modify such construction by formingthe fulcrum notch directly in the stylus lever and mounting the latterupon a wall of the slot, Fig. 7 illustrating such a modification asapplied to a sound box of the type shown in Figs. 1 and 3, but it will,of course, be'understood that like modifications can be made in theconstruction of a sound box of the type shown in Figs. 2 and 4.

I claim 1. The combination of a sound box casing, a plate securedthereto and having a slot therein, and a stylus lever passing throughsaid slot and fulcrumed directly upon one of the walls of the same.

2. The combination of a sound box casing, a plate secured thereto andhaving a slot therein, a stylus lever passing through said slot andfulcrumed -upon one of the walls thereof, and a spring on the platebearing upon but being disconnected from the stylus i forthe of leverand serving to maintain said fulcrum bearing.

3. The combination of a sound box casing, a plate secured thereto, andhaving a slot therein, a stylus lever passing through said slot andfulcrumed upon one of the Walls of the same, and a spring constitutingan integral part of said plate, said spring bearing upon but beingdisconnected from the stylus lever and serving to maintain the fulcrumbearing of the latter.

4. The combination of a sound box casing, a stylus lever having notchedtrunnions, a plate slotted for the reception of said trunnioned portionof thestylus lever and having projecting fulcrum lugs for saidtrunnions, and a spring constituting anintegral part of said plate, saidspring bearing upon the stylus lever, and serving to maintain itsnotched. trunnions in contact with said fulcrum lugs.

5. The combination of the sound box casing, its diaphragm and styluslever, a plate secured to said casing and presenting a fulcrum for saidstylus lever, and a spring hearing upon but being disconnected from theback of the stylus lever and serving to press the same towards thediaphragm and fulcrum. 6. The combination of the sound box casing itsdiaphragm and stylus lever, a plate secured to said casing andpresenting a fulcrum for said'stylus lever, and a spring oon stitutingan integral part of said plate, said spring bearing upon the baok of thestylus lever and serving to press the same towards the diaphragm andfulcrum.

7. A combined fulcrum and spring plate a sound box, said plate havin' afulcrum for the stylus lever, and a projecting spring-tongue for bearingupon the lever and pressing the same towards said fulcrum.

8. A combined fulcrum and spring plate forthe stylus lever of a soundbox, said plate having a slot for the reception of the stylus lever, anda rojecting spring tongue for bearing upon the lever and pressing thesame towards one of the Walls of the slot. 7 9. A combined fulcrumandspring plate for the stylus lever of a sound box, said pis e having aslot With laterally separated iulcrum lugs therein and a spring tonguefor pressing the stylus lever towards said iulcrum lugs.

if). A eon'ibined fulcrum and spring plate for the stylus lever of asound box, said plate having a slot Whosebottom Wall constitutes afulcrum for the lever, and a bent top member constituting a spring forbearing upon the back of the lever.

11. A cpmbined fulcrum and spring plate for the stylus lever of a soundbox, said plate having a slot Whose bottom Wall presents laterallyseparated lugs constituting a fulcrum for the lever, and a bent topmember constituting a spring for bearing upon the back of the lever.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

- THOMAS KRAEMER.

lV'tness'es:

HAMILTON D. TURNER, .iiATE A. BEADLE.

